If you're talking about the discrepancy detectorYou click/highlight to peices of data and if it says: DISCREPANCY DETECTED!Click interrogate (at the left side)If it says: MATCHING DATA just leave it as is.And NO CORRELATION means its not related at all to the 2 peices of data

Expanding the previous post and giving examples: (Also, it's use is indeed to highlight two pieces of info and detecting discrepancies between them.)If the person doesn't give all documents, you must go to the rule book, highlight the rule and the counter and it will say discrepancy detected. It can also be used to match the person and the photo, supposed height and the person's actual height, supposed weight and person's actual weight, etc.